[SOLVED] I'm looking for QIKU Q Terra Exclusive repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my QIKU Q Terra Exclusive. It's started acting up, and I'm looking for a detailed service manual with boardviews and schematics to properly diagnose and repair it. I need to take precise voltage measurements around the board, so having the right documentation would be very helpful.

Thanks in advance for your help.

Selected Answer

I actually found that service manual on a tech Discord server a while back. A really helpful member there shared a direct link to their blog and I've saved it. I'm happy to pass it along here. Hopefully, these boardviews and schematics help you fix your phone, just like they got me through my repair. Looks like we have the same model.

@Mika

Absolute legend! That's exactly the info I was searching for. This is going to save me so much time probing in the dark. Seriously, thanks a ton for sharing the link!

Hi there,

I also have the QIKU Q Terra Exclusive and just downloaded the manual you shared. I'm pretty new to board-level phone repair, and this is a bit intimidating with all the tiny test points and the schematics. Could you point me in the right direction on how to start troubleshooting this ? Any advice on the first few things I should check would be a massive help.

Thanks so much for your time

General advices: start by checking the voltage at the battery connector on the board. With a known-good battery connected, you should see a steady voltage between 3.7V and 4.2V. After that, a great next step is to check the main power management IC (PMIC) for shorts. Using your multimeter in diode mode, check for shorts on the large input capacitors surrounding the PMIC.

Here are a few useful references for troubleshooting your device:
https://www.ifixit.com/Answers/View/356008/How+do+I+install+a+fingerprint+reader
Take a look at comment #928
Also, this : https://xdaforums.com/t/adobe-flashplayer-no-more.1740906/.
You can also check this video starting from minute 1:

The QIKU Q Terra Exclusive service manual and boardviews from the link above were exactly what I've been searching for. I couldn't find a complete, free copy anywhere else. Seriously, thank you for sharing this you're a lifesaver!

Hi everyone, I'm working on a QIKU Q Terra Exclusive with a no power issue and need some guidance with my measurements.
I'm detecting 3.3V on the VREG_MAIN line (pin 1 of the PMIC), which looks good, but I'm getting 0V on the VDD_CPU line (pin 8) where the schematics indicate I should see about 0.9V.
Since this is a core voltage for the application processor, could this missing rail be why the device shows no signs of life?
What's the best procedure to diagnose this further? Should I check for shorts on the CPU rail first, or look at the PMIC's enable signals?
I've already verified the main 3.3V and 1.8V power rails are present and stable.

My QIKU Q Terra Exclusive was working perfectly until yesterday when it suddenly went completely dead. Now it won't respond to the power button, doesn't vibrate, and shows no signs of life even when connected to a charger. I'm worried there might be a serious issue.

I have a decent multimeter, a basic soldering iron, and a healthy dose of patience. While I've successfully replaced iPhone batteries and charging ports, this will be my first attempt at actual diagnosis. The sheer density of BGA chips and microscopic components is honestly a bit overwhelming.

I'm particularly curious about the alcohol trick I've seen online where you apply isopropyl to the board and look for evaporation hotspots to locate shorts. Is this actually a reliable method for beginners, or are there better approaches I should try first with just a multimeter?

I learned this lesson the hard way last month with mine, it was declared "dead" by two different shops. The phone showed absolutely no signs of life - no charging indicator, no vibration, nothing. Before diving into complex board work, I decided to try one more basic test: wireless charging.

To my complete surprise, it actually heated up on the charging pad! This single discovery completely changed my diagnostic path. It turned out the issue wasn't with the main board or processor, but with the notoriously fragile USB-C port that had failed completely. A $15 replacement part and some careful soldering brought it back to life.

The moral? Always exhaust every external testing method before opening the device. Test wireless charging if available, try different charging methods, and don't assume the worst case scenario. Sometimes the most "dead" devices have the simplest solutions hiding in plain sight.

I suspect my issue might be related to that cheap, third-party fast charger I used at the airport last week... Now the device gets extremely hot during charging, the screen flickers at low brightness, and sometimes it randomly shuts down at 30% battery. Could this have damaged the power management IC or battery calibration?

If your QIKU Q Terra Exclusive starts acting up, random reboots, fast battery drain, or connectivity issues, there are several diagnostic steps you can take before assuming the worst:

• Check your charging habits: Using poor-quality chargers or wireless pads can gradually damage your battery and charging circuit, leading to unpredictable behavior.
• Inspect the physical components: A slightly damaged charging port, worn battery, or even accumulated pocket lint can cause issues that seem like major hardware failures.
• Monitor temperature patterns: If your phone gets unusually hot during specific tasks (like camera use or gaming), it could point to a failing component rather than a software issue.
• Use diagnostic tools wisely: Ampere for battery health, phone diagnostic codes (*#0*# on many models), and a thermal camera can reveal problems without opening the device.
• Know when to stop: If you see liquid damage indicators tripped or smell burnt electronics, it's time to consult a professional before causing irreversible damage.

Also visit this link it may help : https://xdaforums.com/t/q-can-we-have-such-kernel-and-features.2465701/

Here's what I discovered on forums and technical databases:

Rinsing: Once the motherboard appears clean, it's vital to rinse off any residual cleaning solution and dislodged contaminants. Next, focus on the smartphone's software configuration for dual-SIM management: Download iOS: iTunes/Finder will download the latest iOS software for your device. Close Back Cover/Display: Carefully align and close the back cover or display assembly. Examples include "JScreenFix" (website-based), "Dead Pixel Detect and Fix," or "Pixel Fixer." Many specialized CRMs for repair shops exist (e.g., RepairShopr, CellRepair). Do Not Disturb (DND) Mode: Ensure DND is not active, as it often silences all notifications, including visual ones. Check IMEI (dial #06#), try making a call, test mobile data, and observe signal strength. A common and effective method is to use a soft-bristled toothbrush that is clean and dry. If this is the case, even perfect external alignment won't help, as the internal coil is out of position relative to the phone's chassis. Excessive "Mobile network standby" or "Wi-Fi" usage: This could indicate poor signal strength forcing the phone to work harder to maintain a connection, or issues with network scanning. Proximity Sensor: Detects nearby objects without physical contact, primarily used to turn off the screen during calls to prevent accidental touches. The machine will first draw a vacuum, you'll hear the pump operating, and the pressure gauge will drop. If the GPU can only render at 60fps, a 120Hz screen won't deliver a true 120Hz experience for that specific content. For instance, the proximity and ambient light sensors are frequently part of the display assembly or a separate top flex cable. Traces: A broken trace that comes into contact with another trace or a ground plane. However, the market has responded with high-quality third-party alternatives that meticulously mimic the specifications and functionality of OEM tools. Schematic Diagrams and Boardview Software: These are invaluable resources. This prevents any debris from entering, protects sensitive electronics from sanding vibrations or accidental contact, and allows you to work more freely without damaging the screen. While its physical click functionality is straightforward to restore, modern smartphones, particularly iPhones with Touch ID or Face ID, introduce significant complexities due to component pairing and biometric security. Safety Note: If you suspect a swollen battery (refer to Topic 4), address that issue first and with extreme caution, as it can be pressing on the power button. When a kernel is incompatible or drivers are missing/corrupted, the hardware either won't work or the system will become unstable. Power Management ICs (PMICs): Critical for regulating power, often fail due to charging issues or voltage spikes. Signal Strength Apps: Use a third-party app that can display detailed cellular signal strength (e.g., in dBm) or Wi-Fi signal strength to gather quantitative data. The ground plane of the logic board is equally vital; it acts as a reference for the antenna, influencing its performance characteristics. Clean Charging Port: Start by meticulously cleaning the charging port with a non-conductive tool and possibly a small amount of IPA. Carefully desolder the resistor from the donor board and measure its value using a multimeter. A faulty FEM can manifest in various ways, from poor signal reception and dropped calls to, significantly, excessive power draw that rapidly depletes the battery. The camera adjusts the lens until the maximum contrast is achieved, as a sharp image will have higher contrast than a blurry one. A faulty PMIC can cause erratic power delivery, leading to instability and forced restarts.

@Vinicius, Not sure what you're trying to say but ok :)